Needle-vibrating mechanism for sewing machines



April 9, 1935. G. M. EAMES' NEEDLE VIBRATING MECHANISM FOR SEWING MACHINES 3 Sheets-Sheet 1 Filed Dec. 22, 1953 J1. flames A ril 9, 1935. s. M. EAMES 1,997,411

NEEDLE VIBRATING MECHANISM FOR SEWING MACHINES Filed Dec. 22, 1933 5 Sheets-Sfieet 2 Georye M [James April 9, 1935. G, EAMES 1,997,411

NEEDLE VIBRATING MECHANISM FOR SEWING MACHINES Fi-led Dec. 22, 1953 I5 Sheets-Sheet 3 VIII/l...

Geo ye J1. flames Patented Apr. 9, 1935 Q P? 112 iv Application December 22, 1933,; Serial w I 8Claims. (o1. 112" s) invention relates" to improvements in needle vibrating mechanisms for zigzag stitch sewing machines and more particularly in the needle-vibrating mechanism" disclosed in the U.) s. patent {of o. F. 'Gray, no. 1,020,-os9,' ar.

The primary object of this invention isito I provide aneedle-vibrating mechanismof simple construction and quickly adjustable for effecting the production of either straightaway or zigzag stitch'productionof either straightaway or zigzag stitch' sea'msj A further-object of the inven- 'tion: is l to provide a needle-vibrating mechanism whichlflend's itself to convenient assemblage of the component parts thereof in a sewin'gf machine.

"With these and otherjobjects in view as will hereinafter appear, 'the'invention comprises the devices; combinations and arrangements of'parts hereinafter set forth andfillus'trated-inthe ac"- coinpanying drawings of a preferred embodiment of the invention, from which the several features of the invention andthe advantages attained thereby will be readilyunderstood bythds Skilled intheart.

side elevation, partlyin section, of l a sewing machine containing the improved needle-vibrating mechanism; Fig. 2 isailear'side elevationfof.

the machine." Fig. a section of the bracket arm in substantially the vertical plane containing the transverse crank-shaft. Fig.4 is a vertical section of the adjusting spindle, substantially on the line 4+4 ofFig; 3. i Fig. 5 -is anQtherverticaI section of the adjustingspindlz, substantially on the'line 5-5 of Fig. 3. Fig. (i is a horizontal section of the crank-end of the adjusting spindle. Figq'? represents a perspective View 'ofthecrankshafflbushing. 1 I

The present improvements have been embodied in ase mg machine constructed.substantially in acccrdance' withthat forming the subject of my pending patent application filed Got-I 3, 1933."

Referring-to the drawings the sewing I has a work' supporting bed-plate'l, fromoneend ofiwhichrrises"thehollowstandard 2 of a-bent bracket arm fl, overhanging the bed-plat and terminating in a head 4 clpsfedatits outer end bya detachable coverplateii I j Rotatably journaled in suitable bearings provided i n said bracket-arm 3 is a horizontally dis po'sed main or needle-reciprocatingshaft Sex; tending lengthwiseof the bracket-arm andbarry ing at one end a driving pulley 1'. At its opponavoasss site'lend; the "mainshaft fic arries a counter balanced crank 8' provided with a crank-pin connectedby 'a jointedjlink I0 toa' co-1lar" |"se-' cured upon a needle-bar l 2, carryin'g'at its lower end a"needlel3.f

Theneedle-b-ar I2 is journaled for endwisevertical reciproc'ation insuitable bearings provided in a vibratory gate l4, hu'n'gjat its upper end upon a fulcrum-pin l5 for-swinging movements of the gate l4 about a' 'pivo a1 axis transverse to the Extendinghorizontally from the lowereiid of the vibratory gate I l .within a suitable'guideway Embrac'ingthe pivot-block I1; is the forked lower it a end "of -'a rock-arm I 8 depending from the front, 7

ena a short rock sha'ft l9 disposed horizontally transverse'to the main shaft 6 and fsuitably'jour- Extending upwardly fromthe rock-shaft 1'9, at

the rearward side of the. head 1 4;: is arock-arm 200i which the free'end'is' connected by a pivot;

) i screwfzl to one e'ndof a pitman- 22 disposed-hori'- In the accompanying'drawings, Fig: 1' is a front zontally andexternany at the rearwardside" of the bracket-arm 3.

'Atits opposite end, the pitman 22 1s apertured, T

td're'ceive alcrank-pin13 formed by shouldered boss at the rearward side of an adjustable crank member 24, theapertured end of the 'pitm an be;

'guide s'crew 29'at'the opposite side' of said crank} shaft. axis. The guidefscrewjfl "passes' through anarcuate slot 30, provided in thefcrank m'ember and having the pivot-screwlll' as its center' of' 1 curvature] i i H I The flange? 26 of'the crank-shaft 2! and the V crank-member '24 carried thereby are housed a recess 3l i'or med by a depressed portion of'the rearward wall of the bracketarm 3. the 'pitma n 22 7 extending through a S1015 32 ill the Side wall. of said recess; "A cover-plate 3.3 f01fth6 recess is "secured by a screw 34 upon the bracket-arm 1:0 provide foriconvenie'ntly swinging th cover plate upwardly into a recess-exposing position illustrated by dot-dash lines in Fig. 2. V The in ner wall 3' of therecess 3l 'is provided with a 20 naledat the undersideofthe-bracket-armhead;

crank-shaft 21, the forward end of said shaft being disposed in a bushing 36 rotatably journaled in a bearing aperture 31 in the'front wall of the bracket-arm 3. At its forward end the bushing 36 has a flange 38 into which are threaded setscrews 39for securing the bushing to the crankshaft ZL'said flange 38 having asegmentalrecess 38 in" its front face providing opposed stopspind e shoulders 40, 4|. Secured upon the crank-shaft 21, within the bracket-arm 3, is a spiral gear 42 engaged by a spiral driving. gear 43 carriedby the main shaft 6, said gears being constillfited so;

that the crank-shaft 21 is rotated at one half the speed of rotation of the main shafi jfi. V

Journaled for turning movement in .thecrankfshaft 21 is a crank-member adjusting spindle;

having at its rearward endlianeccentricc-head .45.

fitted within a yoke-shaped recess 46 proyidedin the inner face of the crank-member 24.- For'con ehiently t r in the ad ust n spindle 44 manual yra ma i u at n mem e :1 iSiS C -IedDY a et-sc w up n th pr j ctin tendof d C r th man pulatin head 41 is a stop-pin 49 which extends between-and 00-. ac i h't s n h ulders 40,41 of'thecrank- V shaft u h ng; 36, to l m t n ular adjus ent: of

the; spindle 44,. 'A: friction-washer 50 iisaflinter Poi between the i eead and th front end of the crank-shaft 21; said:friction washer a t t ainteinthe adjusted position of th cran -pin 2 th pitma ll mains stationary du in the p ion f t e mac ne, whereby the-needlesbar l Z-isrecipmcated inafixed path. it n wvpa tly rotatin the adjusting: spindle 44 m hua r,.:. e ns ance unti h st pmin flf engages the other of the stop-shoulders 40; 4|, the turnin o th centri -head 4.5; sw n s the sire- -'rhem 24 abo he pivot-screw 28,- here i sh ftin the erank p h 011 Center withre he t teth f e crank -shaft 21.- When. the mseh h s wepe ated. the: pitman i is r eip eeate oi mn r v at m vemen s-to thegate- I41," whereby the-needle'is successively reeie ee t hspae dpa hs;

uitah .v1eep-taking means may b m-' p aye a eemp mehtar to th he dl n th '7 ormat on of stitche wh l workea'dvanc ne m ansandfanepp ed-p se dev e may or m y nethe" embe i dih he-m e n de t-upon thereha a r of the wo k Hav n hus set erth t e name: the inven tie twha-t I9 aim'hereinistE V '1. 'In' a sewing machine, a laterally vibratory ra e, a ne d =ha i u naledf s i f a ei endwise reciprocation, a rotary; crankshaft,"

means for rotating said'shaftz a crank-member 'adjiistably carried by said'cranki-sha-ft; apitman eonnectedtto saidcrank-inember and to slaid vibratoryframe, an eccentric disposed inoperative en agement. with said crank member' to effect adjustment. ther e d manual y o e a means for turning saideccentric relativelytosaid crankzmember; 3

24. '8! sew n -machine, a lateral y" vibr ory bearing aperture 35 for the rearward end of the frame, a needle-bar journaled in said frame for I r endwise reciprocation, a rotary crank-shaft,

means for rotating said shaft, a recessed crankcrankshaft to thereby effect adjustment of said crank-member. I

3. A sewing machine having a bracket-arm, a

vibratory needle-bar frame mounted in said bracket arm, arotary actuating shaft journaled in said bracket-arm, a tubular crank-shaft ro-tatably journaled'in said 1 bracket-arm and geared to be .driven by said actuating shaft, a crank-member adjustably carried by said crank-shaft, a pitman connected-to said crank=member-andto saidIVibratory frame ani adjusting spindle extending lengthwise of andjournaled'in said-tubular crank shaft; and:an eccentricrcarried by saidv adjusting spindle in operative en agement with the crank-I member to effect adjustment of vsaid membenl. 4; 'A sew-inglmachinehavinga bracket-arm; a

vibratory needle-bar frame mounted in: said bracket=arm,.a rotary actuating" shafttjoumaled in'saidbracketI-arm, a tubular crank-shaft ro tatably journaled in said bracketearm extending transversely of: and gearedto be driven-bysaid actuating shaft, 2; crank-pin carrying member pivotally; mounted uponsaid crank shaft for ad? justmentof the crankapin into-and out ofaline} ment with the axis of V rotation of the cram? shaft a pitman embracing said crank-pin a'ndTop -V erati-velyconnected to yibrater said frame, an ad i justing' spindle-extending lengthwise of and=journaledin saidtubular'cranksshaft and an eccens tric carriedsby saidadjnsting spindle inoperative engagement with theEcrank-pin carrying :member to effect adjustment of said member.

5: Asewing machine havingia' bracket-arm, a v

shaft, aneccentriccarried by said adjusting spindle in operative engagement with said crank-j memberlto effect adjustment thereof, andmeans for inducing unison-rotationofsaid crank-shaft and adjusting spindle during the operation ofthe machine. 7 1

6,1 A: sewing machine having a bracket-arm, a

vibratory needle-bar frame mounted in said bracket-arm, a rotary actuating shaft-journaled in said bracket-arm, altubular crank shaftfro s tatably journaled in said bracket-arm extending transversely of and geared to be driven-by said actuating shaft, a yoked crank-member adjustably carried-by said crank-shaft at one end thereof, apitrnan actuated by saidcrank memberand operatively connected to'vibrate saidframe, an adjustingspindle extendingr lengthwise of and journaled in said tubular crankshaft, acrankniember adjusting eccentric carried by said adjusting-spindle and embraced by theyoke of said cr n -m mbe and opp ed t p m n turning movements of said adjusting spindle relatively to said crank-shaft.

'7. A sewing machine having a bracket-arm, a vibratory needle-bar frame mounted in, said bracket-arm, a rotary actuating shaft journaled in said bracket-arm, a tubular crank-shaft r0- tatably journaled in said bracket-arm extending transversely of and geared to be driven by said actuating shaft, a yoked crank-pin carrying member pivotally mounted upon one end of said crankshaft for adjustment of the crank-pin into and out of alinement with the axis of rotation of the crank-shaft, a pitman embracing said crank-pin and operatively connected to vibratesaidframe, an adjusting spindle extending lengthwise of and journaled in said tubular crank-shaft, an eccen tric carried by said adjusting spindle and embraced by the yoke of the crank-pin carrying member, a bushing carried by said crank-shaft and having opposed stop-shoulders, and a stoppin carried by. said adjusting spindle between said stop-shoulders. i

8 A sewing machine having a bracket-arm, a laterally vibratory frame mounted in said bracket-arm, ajneedle-bar j ournaled in said frame for endwise reciprocation, a rotary actuating shaft extending lengthwise of and journaled in said bracket-arm, connections with said-actuatingshaft for reciprocating said needle-bar, a crank -v shaft rotatably journaled in said bracket-arm extending transversely of and geared to be driven by said actuating shaft, a crank-pin carrying member adjustably mounted upon said crankshaft at the rearward side of said bracket-arm, an eccentric disposed in engagement with the a crank-pin carrying member to effect adjustment of said member, an eccentric-carrying spindle, a

manipulating member carried by said spindle at the front side of said bracket-arm for turning said spindle relatively to said crank-shaft, and

friction means for inducing rotation of said spindie with said crank-shaft during the operation of 

